【记录】JAVAWeb开发之Servlet-19.Filter

╰半橙微兮° 2022-02-28 06:28 220阅读 0赞

不错的文章：

[http://www.blogjava.net/yangaiyou/archive/2007/08/29/140854.html][http_www.blogjava.net_yangaiyou_archive_2007_08_29_140854.html]

[http://blog.csdn.net/qie2327023/article/details/7004578][http_blog.csdn.net_qie2327023_article_details_7004578]

[http://www.iteye.com/problems/41978][http_www.iteye.com_problems_41978]

Filter 简介

–创建Filter的步骤  
–获得Filter的初始化参数  
–Filter 实例   
?字符编码 Filter  
?权限验证 Filter  
\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#  
? Filter 简介   
–Filter位于客户端和请求资源之间，在此起到过滤作用   
–请求资源可以是，Servlet、JSP页面、HTML页面等   
–他们在请求资源的前后来执行   
–请求和响应通过Filter可以被修改   
–Filter 常用在如下几个方面：   
? Session 管理  
? 权限验证  
? 日志记录  
? 字符编码转换  
Filter 简介图示  
[![27212_1268813732GjXf.png][]][27212_1268813732GjXf.png 1]   
? 创建Filter的步骤  
– Filter 接口   
? init 方法  
 public void init(FilterConfig filterConfig) throws ServletException   
? doFilter 方法   
public void doFilter(ServletRequest request,   
ServletResponse response,   
FilterChain chain)   
throws java.io.IOException,   
ServletException   
? Destroy 方法   
public void destroy()  
  
– 创建Filter步骤  
? 创建一个类实现Filter接口   
– 方法: doFilter, init, destroy   
?在doFilter方法中处理逻辑   
– 参数: ServletRequest, ServletResponse, FilterChain   
? FilterChain 调用doFilter方法   
– 调用下一个过滤器或实际资源   
? 注册filter，来过滤Servlet 和Jsp   
–在web.xml中，使用 filter 和 filter-mapping  
简单的Filter实例  
[![27212_1268813740lvPd.png][]][27212_1268813740lvPd.png 1]   
调用WebRoot下面的testFilter.html测试Filter起作用了没？  
[![27212_1268813746dizi.png][]][27212_1268813746dizi.png 1]  Filter没有执行哈~  
再次测试admin下的testFilter有没起作用？  
[![27212_126881375423rk.png][]][27212_126881375423rk.png 1]  [![27212_1268813757SAfM.png][]][27212_1268813757SAfM.png 1]  pass herer~~~~~~在控制台打印出来了,但是页面没有显示Test Filter 1,证明被Filter拦截了。下面我们过滤链调用doFilter方法。  
[![27212_1268813758InQD.png][]][27212_1268813758InQD.png 1]   
再次执行页面。  
[![27212_1268813762j4T6.png][]][27212_1268813762j4T6.png 1]   
页面显示了Test Filter 1了  
[![27212_12688137663UnK.png][]][27212_12688137663UnK.png 1]   
结构与Servlet相似。  
MyFilter.java  
package com.michael.servlet;  
  
import java.io.IOException;  
  
import javax.servlet.Filter;  
import javax.servlet.FilterChain;  
import javax.servlet.FilterConfig;  
import javax.servlet.ServletException;  
import javax.servlet.ServletRequest;  
import javax.servlet.ServletResponse;  
  
public class MyFilter implements Filter \{  
  
public void destroy() \{  
\}  
  
public void doFilter(ServletRequest arg0, ServletResponse arg1,  
FilterChain chain) throws IOException, ServletException \{  
System.out.println("pass here~~~~~~~~");  
chain.doFilter(arg0, arg1);  
\}  
  
public void init(FilterConfig arg0) throws ServletException \{  
\}  
  
\}  
  
  
web.xml  
<?xml version="1.0" encoding="UTF-8"?>  
<web-app version="2.4"  
xmlns="http://java.sun.com/xml/ns/j2ee"   
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   
http://java.sun.com/xml/ns/j2ee/web-app\_2\_4.xsd">   
<filter>  
<filter-name>MyFilter</filter-name>  
<filter-class>com.michael.servlet.MyFilter</filter-class>  
</filter>  
<filter-mapping>  
<filter-name>MyFilter</filter-name>  
<url-pattern>/admin/\*</url-pattern>  
</filter-mapping>  
</web-app>  
  
  
testFilter.html  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">   
<html>  
<head>  
<title>testFilter.html</title>  
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">  
<meta http-equiv="description" content="this is my page">  
<meta http-equiv="content-type" content="text/html; charset=UTF-8">  
  
</head>  
<body>  
<h1>Test Filter 1</h1>  
</body>  
</html>  
  
  
? 获得Filter的初始化参数   
–在web.xml配置文件的Filter声明中配置初始化参数  
[![27212_1268813769BQPr.png][]][27212_1268813769BQPr.png 1]   
[![27212_12688137709u5g.png][]][27212_12688137709u5g.png 1]   
–在Filter实现类中获得初始化参数  
[![27212_1268813771kjRP.png][]][27212_1268813771kjRP.png 1]  
[![27212_1268813776AtfA.png][]][27212_1268813776AtfA.png 1]  
[![27212_1268813780Kzx9.png][]][27212_1268813780Kzx9.png 1]   
? Filter 实例  
–字符编码 Filter  
[![27212_12688137843jgY.png][]][27212_12688137843jgY.png 1]   
[![27212_126881379178XD.png][]][27212_126881379178XD.png 1]   
测试一下提交的中文是否乱码？  
[![27212_1268813796Fq66.png][]][27212_1268813796Fq66.png 1]   
用户名显示为乱码  
[![27212_126881380052jO.png][]][27212_126881380052jO.png 1]   
下面我们将整个页面设置统一编码，用Filter来解决哈~  
web.xml  
<?xml version="1.0" encoding="UTF-8"?>  
<web-app version="2.4"  
xmlns="http://java.sun.com/xml/ns/j2ee"   
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   
http://java.sun.com/xml/ns/j2ee/web-app\_2\_4.xsd">   
<filter>  
<filter-name>MyFilter</filter-name>  
<filter-class>com.michael.servlet.MyFilter</filter-class>  
<init-param>  
<param-name>encoding</param-name>  
<param-value>gbk</param-value>  
</init-param>  
</filter>  
<filter-mapping>  
<filter-name>MyFilter</filter-name>  
<url-pattern>/admin/\*</url-pattern>  
</filter-mapping>  
<filter>  
<filter-name>EncodingFilter</filter-name>  
<filter-class>com.michael.servlet.EncodingFilter</filter-class>  
</filter>  
<filter-mapping>  
<filter-name>EncodingFilter</filter-name>  
<url-pattern>/\*</url-pattern>  
</filter-mapping>  
<servlet>  
<servlet-name>RegisterServlet</servlet-name>  
<servlet-class>com.michael.servlet.RegisterServlet</servlet-class>  
</servlet>  
<servlet-mapping>  
<servlet-name>RegisterServlet</servlet-name>  
<url-pattern>/servlet/RegisterServlet</url-pattern>  
</servlet-mapping>  
</web-app>  
  
  
  
register.html  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">   
<html>  
<head>  
<title>register.html</title>  
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">  
<meta http-equiv="description" content="this is my page">  
<meta http-equiv="content-type" content="text/html; charset=UTF-8">  
  
</head>  
<body>  
<form name="f1" id="f1" action="/Servlet\_Filter/servlet/RegisterServlet" method="post">  
<table border="0">  
<tr>  
<td>Username:</td>  
<td><input type="text" name="username" id="login"></td>  
</tr>  
<tr>  
<td>Password:</td>  
<td><input type="password" name="password" id="password"></td>  
</tr>  
<tr>  
<td colspan="2" align="center"><input type="submit" value="Register"></td>  
</tr>  
</table>  
</form>  
</body>  
</html>  
  
  
RegisterServlet.java  
package com.michael.servlet;  
import java.io.IOException;  
import java.io.PrintWriter;  
import javax.servlet.ServletException;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
public class RegisterServlet extends HttpServlet \{  
/\*\*  
\* Constructor of the object.  
\*/  
public RegisterServlet() \{  
super();  
\}  
/\*\*  
\* Destruction of the servlet. <br>  
\*/  
public void destroy() \{  
super.destroy(); // Just puts "destroy" string in log   
// Put your code here   
\}  
/\*\*  
\* The doGet method of the servlet. <br>  
\*  
\* This method is called when a form has its tag value method equals to get.  
\*  
\* @param request the request send by the client to the server  
\* @param response the response send by the server to the client  
\* @throws ServletException if an error occurred  
\* @throws IOException if an error occurred  
\*/  
public void doGet(HttpServletRequest request, HttpServletResponse response)  
throws ServletException, IOException \{  
doPost(request,response);  
\}  
/\*\*  
\* The doPost method of the servlet. <br>  
\*  
\* This method is called when a form has its tag value method equals to post.  
\*  
\* @param request the request send by the client to the server  
\* @param response the response send by the server to the client  
\* @throws ServletException if an error occurred  
\* @throws IOException if an error occurred  
\*/  
public void doPost(HttpServletRequest request, HttpServletResponse response)  
throws ServletException, IOException \{  
String username = request.getParameter("username");  
String password = request.getParameter("password");  
response.setContentType("text/html");  
PrintWriter out = response.getWriter();  
out  
.println("<!DOCTYPE HTML PUBLIC \\"-//W3C//DTD HTML 4.01 Transitional//EN\\">");   
out.println("<HTML>");  
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");  
out.println(" <BODY>");  
out.print(username);  
out.print(password);  
out.println(" </BODY>");  
out.println("</HTML>");  
out.flush();  
out.close();  
\}  
/\*\*  
\* Initialization of the servlet. <br>  
\*  
\* @throws ServletException if an error occurs  
\*/  
public void init() throws ServletException \{  
// Put your code here   
\}  
\}  
  
  
EncodingFilter.java  
package com.michael.servlet;  
import java.io.IOException;  
import javax.servlet.Filter;  
import javax.servlet.FilterChain;  
import javax.servlet.FilterConfig;  
import javax.servlet.ServletException;  
import javax.servlet.ServletRequest;  
import javax.servlet.ServletResponse;  
public class EncodingFilter implements Filter\{  
public void destroy() \{  
// TODO Auto-generated method stub   
\}  
public void doFilter(ServletRequest request, ServletResponse response,  
FilterChain chain) throws IOException, ServletException \{  
request.setCharacterEncoding("gbk");  
response.setCharacterEncoding("gbk");  
chain.doFilter(request, response);  
\}  
public void init(FilterConfig arg0) throws ServletException \{  
// TODO Auto-generated method stub   
\}  
\}  
  
  
可以正常显示中文了哈~  
[![27212_1268813834cbPz.png][]][27212_1268813834cbPz.png 1]   
–权限验证 Filter  
web.xml  
<?xml version="1.0" encoding="UTF-8"?>  
<web-app version="2.4"  
xmlns="http://java.sun.com/xml/ns/j2ee"   
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee   
http://java.sun.com/xml/ns/j2ee/web-app\_2\_4.xsd">   
<filter>  
<filter-name>MyFilter</filter-name>  
<filter-class>com.michael.servlet.MyFilter</filter-class>  
<init-param>  
<param-name>encoding</param-name>  
<param-value>gbk</param-value>  
</init-param>  
</filter>  
<filter-mapping>  
<filter-name>MyFilter</filter-name>  
<url-pattern>/admin/\*</url-pattern>  
</filter-mapping>  
<filter>  
<filter-name>EncodingFilter</filter-name>  
<filter-class>com.michael.servlet.EncodingFilter</filter-class>  
</filter>  
<filter-mapping>  
<filter-name>EncodingFilter</filter-name>  
<url-pattern>/\*</url-pattern>  
</filter-mapping>  
<filter>  
<filter-name>SessionFilter</filter-name>  
<filter-class>com.michael.servlet.SessionFilter</filter-class>  
</filter>  
<filter-mapping>  
<filter-name>SessionFilter</filter-name>  
<url-pattern>/admin/\*</url-pattern>  
</filter-mapping>  
<servlet>  
<servlet-name>RegisterServlet</servlet-name>  
<servlet-class>com.michael.servlet.RegisterServlet</servlet-class>  
</servlet>  
<servlet>  
<servlet-name>LoginServlet</servlet-name>  
<servlet-class>com.michael.servlet.LoginServlet</servlet-class>  
</servlet>  
<servlet-mapping>  
<servlet-name>RegisterServlet</servlet-name>  
<url-pattern>/servlet/RegisterServlet</url-pattern>  
</servlet-mapping>  
<servlet-mapping>  
<servlet-name>LoginServlet</servlet-name>  
<url-pattern>/servlet/LoginServlet</url-pattern>  
</servlet-mapping>  
</web-app>  
  
  
login.jsp  
<%@ page language="java" import="java.util.\*" pageEncoding="gbk"%>  
<%  
String path = request.getContextPath();  
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";   
%>  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">   
<html>  
<head>  
<base href="<%=basePath%>">  
<title>My JSP 'login.jsp' starting page</title>  
<meta http-equiv="pragma" content="no-cache">  
<meta http-equiv="cache-control" content="no-cache">  
<meta http-equiv="expires" content="0">  
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">  
<meta http-equiv="description" content="This is my page">  
  
</head>  
<body>  
$\{Login\_Error \}  
<form name="f1" id="f1" action="/Servlet\_Filter/servlet/LoginServlet" method="post">  
<table border="0">  
<tr>  
<td>Username:</td>  
<td><input type="text" name="username" id="login"></td>  
</tr>  
<tr>  
<td>Password:</td>  
<td><input type="password" name="password" id="password"></td>  
</tr>  
<tr>  
<td colspan="2" align="center"><input type="submit" value="Login"></td>  
</tr>  
</table>  
</form>  
</body>  
</html>  
  
  
LoginServlet.java  
package com.michael.servlet;  
import java.io.IOException;  
import java.io.PrintWriter;  
import javax.servlet.ServletException;  
import javax.servlet.http.HttpServlet;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import javax.servlet.http.HttpSession;  
public class LoginServlet extends HttpServlet \{  
/\*\*  
\* Constructor of the object.  
\*/  
public LoginServlet() \{  
super();  
\}  
/\*\*  
\* Destruction of the servlet. <br>  
\*/  
public void destroy() \{  
super.destroy(); // Just puts "destroy" string in log   
// Put your code here   
\}  
/\*\*  
\* The doGet method of the servlet. <br>  
\*  
\* This method is called when a form has its tag value method equals to get.  
\*  
\* @param request the request send by the client to the server  
\* @param response the response send by the server to the client  
\* @throws ServletException if an error occurred  
\* @throws IOException if an error occurred  
\*/  
public void doGet(HttpServletRequest request, HttpServletResponse response)  
throws ServletException, IOException \{  
doPost(request,response);  
\}  
/\*\*  
\* The doPost method of the servlet. <br>  
\*  
\* This method is called when a form has its tag value method equals to post.  
\*  
\* @param request the request send by the client to the server  
\* @param response the response send by the server to the client  
\* @throws ServletException if an error occurred  
\* @throws IOException if an error occurred  
\*/  
public void doPost(HttpServletRequest request, HttpServletResponse response)  
throws ServletException, IOException \{  
HttpSession session = request.getSession();  
session.setAttribute("UserSession", "user");  
response.setContentType("text/html");  
PrintWriter out = response.getWriter();  
out  
.println("<!DOCTYPE HTML PUBLIC \\"-//W3C//DTD HTML 4.01 Transitional//EN\\">");   
out.println("<HTML>");  
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");  
out.println(" <BODY>");  
out.print(" Welcome you! ");  
out.println(" </BODY>");  
out.println("</HTML>");  
out.flush();  
out.close();  
\}  
/\*\*  
\* Initialization of the servlet. <br>  
\*  
\* @throws ServletException if an error occurs  
\*/  
public void init() throws ServletException \{  
// Put your code here   
\}  
\}  
  
  
SessionFilter.java  
package com.michael.servlet;  
import java.io.IOException;  
import javax.servlet.Filter;  
import javax.servlet.FilterChain;  
import javax.servlet.FilterConfig;  
import javax.servlet.ServletException;  
import javax.servlet.ServletRequest;  
import javax.servlet.ServletResponse;  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
import javax.servlet.http.HttpSession;  
public class SessionFilter implements Filter \{  
public void destroy() \{  
// TODO Auto-generated method stub   
\}  
public void doFilter(ServletRequest request, ServletResponse response,  
FilterChain chain) throws IOException, ServletException \{  
HttpServletRequest hrequest = (HttpServletRequest)request;  
HttpServletResponse hresponse = (HttpServletResponse)response;  
HttpSession session = hrequest.getSession();  
String session\_Value = (String)session.getAttribute("UserSession");  
if(session\_Value!=null&&session\_Value.length()>=0)\{  
chain.doFilter(request, response);  
\}else\{  
hrequest.setAttribute("Login\_Error", "请登录");  
hrequest.getRequestDispatcher("/login.jsp").forward(hrequest, hresponse);  
\}  
\}  
public void init(FilterConfig arg0) throws ServletException \{  
// TODO Auto-generated method stub   
\}  
\}  
  
  
没有登录的状态下直接访问admin目录下的testFilter.thml页面，页面显示“请登录”。  
[![27212_1268813839zjnJ.png][]][27212_1268813839zjnJ.png 1]   
下面我们输入用户名和密码进行模拟登录验证。  
[![27212_1268813842HkfD.png][]][27212_1268813842HkfD.png 1]   
页面显示登录成功！  
[![27212_12688138482QO4.png][]][27212_12688138482QO4.png 1]   
登录成功后我们再访问admin目录下的页面就可以正常访问了哈~  
[![27212_1268813853UbNM.png][]][27212_1268813853UbNM.png 1]

\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#\#

源代码：

[http://www.400gb.com/file/20055483][http_www.400gb.com_file_20055483]

[http_www.blogjava.net_yangaiyou_archive_2007_08_29_140854.html]: http://www.blogjava.net/yangaiyou/archive/2007/08/29/140854.html
[http_blog.csdn.net_qie2327023_article_details_7004578]: http://blog.csdn.net/qie2327023/article/details/7004578
[http_www.iteye.com_problems_41978]: http://www.iteye.com/problems/41978
[27212_1268813732GjXf.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813732GjXf.png
[27212_1268813732GjXf.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813730EV2D.png
[27212_1268813740lvPd.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813740lvPd.png
[27212_1268813740lvPd.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813736CZfy.png
[27212_1268813746dizi.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813746dizi.png
[27212_1268813746dizi.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813744ej7w.png
[27212_126881375423rk.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_126881375423rk.png
[27212_126881375423rk.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813747tNPQ.png
[27212_1268813757SAfM.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813757SAfM.png
[27212_1268813757SAfM.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813757eqs7.png
[27212_1268813758InQD.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813758InQD.png
[27212_1268813758InQD.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813758Np6v.png
[27212_1268813762j4T6.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813762j4T6.png
[27212_1268813762j4T6.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813759bM0v.png
[27212_12688137663UnK.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_12688137663UnK.png
[27212_12688137663UnK.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813764lB82.png
[27212_1268813769BQPr.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813769BQPr.png
[27212_1268813769BQPr.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813767YN5r.png
[27212_12688137709u5g.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_12688137709u5g.png
[27212_12688137709u5g.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813769MgD0.png
[27212_1268813771kjRP.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813771kjRP.png
[27212_1268813771kjRP.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813771cFEn.png
[27212_1268813776AtfA.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813776AtfA.png
[27212_1268813776AtfA.png 1]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813774Tpkn.png
[27212_1268813780Kzx9.png]: http://redking.blog.51cto.com/attachment/201003/17/27212_1268813780Kzx9.png
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